I don't have a SP but run MR front and M3 UL on the rear on by BP. I really like this setup it's fast loose enough and has good drive. I would not like to go bigger on the rear tho. I did have a set of Gx side bite rears but it was too skittish on bigger waves.
I just started using SA 2 on my sp I am 5'9 170 lbs the larger quad set up works really good for drive speed and arching turns, good snaps too, overall good set for the wide tail hybrids. Before I was usin AI for everts on the front gx trailers on the rear, these were super fast but don't hold as well as th SA 2.